.main h2{
    margin: 50px 0 10px 0;
    text-align: center;
    font-size: 14px;
}
.main ul{
    overflow: hidden;
    text-align: center;
}
.main ul li{
    display: inline-block;
    margin: 0 20px;
}
.main>span{
    display: block;
    width: 800px;
    height: 30px;
    border: 1px solid rgb(229, 229, 229);
    background-color: rgb(245, 245, 245);
    line-height: 30px;
    padding-left: 20px;
    margin: 14px auto;
}
.main .text{
    width: 800px;
    margin: 0 auto;
}
.main div p:nth-child(-n+2){
    text-indent: 2em;
}
.main div p:nth-child(3){
    margin-top: 15px;
}
.footer{
    margin-top: 400px;
} 